Optical Member Driving Device FPC Adhesion Stability
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Solution Overview
Problem
Conventional camera devices with sensor shift OIS face issues where the bent state of the FPC (Flexible Printed Circuit) is prone to variation, affecting the stability and accuracy of the optical member driving mechanism.
Innovation Solution
The optical member driving device includes a fixed portion with an accommodation space for the lens device and a movable portion that rockably supports an image sensor, featuring an FPC with a main body connected to the image sensor and a coil substrate on its front surface, where the FPC's connecting portion rises from the main body's edge to the front side and is adhered to the coil substrate, ensuring stability and minimizing variations in the bent state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the FPC is bent to form a box shape with the rising portion opened outward, then the FPC can be easily installed and connected, but the bent state is likely to vary affecting stability
Solution Approach 1:
The FPC's connecting portion is pre-formed with a rising base end portion that protrudes toward the coil substrate before assembly. This preliminary shaping ensures that when the FPC is installed, the connecting portion naturally aligns with and adheres to the coil substrate, pre-establishing a stable bent state that resists variation during operation.
Solution Approach 2:
An adhesive is introduced as an intermediary substance between the base end portion of the FPC's connecting portion and the coil substrate. This adhesive mediator creates a strong bonding interface that secures the FPC in its intended bent position, preventing variation while maintaining the overall flexibility of the FPC structure.
2Reliability
If the FPC connecting portion is secured to the coil substrate, then the bent state stability is improved, but additional assembly steps are required
Solution Approach 1:
The connection between the FPC and coil substrate is achieved by combining the mechanical protrusion of the base end portion with chemical adhesion. The rising base end portion naturally positions itself against the coil substrate, and the adhesive simultaneously bonds both surfaces, merging mechanical and chemical fixation methods into a single integrated connection process.
Solution Approach 2:
The adhesive application is localized specifically to the region where the base end portion of the connecting portion contacts the coil substrate. This localized bonding approach provides targeted stabilization exactly where needed to maintain the bent state, without requiring complex assembly mechanisms or extensive adhesive application across the entire FPC structure.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration stabilizes the bent state of the FPC, enhancing the accuracy and reliability of the optical member driving mechanism by securely fixing the FPC to the coil substrate, thereby reducing movement errors and maintaining consistent performance.
Implementation Method 1
The base end portion is opposed to a side surface of the coil substrate with an adhesive interposed
Data Source
AI summary
An optical member driving device is provided that includes a fixed portion with an accommodation space for a lens device, and a movable portion, which has a holding portion for holding an image sensor, and is rockably supported at a position on a rear side of the lens device. The movable portion includes an FPC having a main body portion connected to the image sensor and a connecting portion for connecting the main body portion and an external device and a coil substrate which is fixed on a front surface of the main body portion of the FPC and on which a coil is formed. The connecting portion has a base end portion which rises from a predetermined position on an edge of the main body portion to a front side. The base end portion is opposed to a side surface of the coil substrate with an adhesive interposed.